<div dir="ltr">Hi community.<div>My apologies for so frequent appealing to you.</div><div><br></div><div>I'm trying to solve problem with ending of sessions.</div><div>The problem consists of no 200 OK coming from uplink on our BYE requests.</div><div><br></div><div>Topology.</div><div>First leg:</div><div>Webrtc client <-wss-> kamailio <-sip tcp-> asterisk routing server</div><div><br></div><div>Second leg:</div><div>Uplink <-sip tcp-> kamailio <-sip tcp-> asterisk routing server</div><div><br></div><div>The problem appears only in case when dialog was ended by webrtc client.</div><div>The first leg (dialog) of the call ends nice, without any hints on problem.</div><div>But the second leg (with uplink) has problem with no 200 OK (coming from uplink) on BYE request coming from asterisk.</div><div><br></div><div>Handshake between asterisk server and uplink establishes properly.</div><div>It looks like:</div><div><br></div><div><a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a> -> INVITE tcp -> our.kamailio.server:5060 -> INVITE tcp -> our.asterisk.server:5060</div><div>.</div><div><a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a> <- 100 trying tcp <- our.kamailio.server:5060<br></div><div>.</div><div><a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a> <- 180 ringing tcp <- our.kamailio.server:5060 <- 180 ringing tcp <- our.asterisk.server:5060</div><div>.</div><div><a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a> <- 200 OK tcp <- our.kamailio.server:5060 <- 200 OK tcp <- our.asterisk.server:5060<br></div><div>.</div><div><a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a> -> ACK tcp -> our.kamailio.server:5060 -> ACK tcp -> our.asterisk.server:5060<br></div><div>.</div><div><a href="http://uplink.domain.com">uplink.domain.com</a> <-media stream-> rtpengine <-media stream-> our.asterisk.server<br></div><div>.</div><div>Here kamailio starts to use random source port for relaying in-dialog BYE</div><div><a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a> <- BYE tcp <- our.kamailio.server:45355 <- BYE tcp <- our.asterisk.server:5060<br></div><div>.</div><div>And here the leg with uplink is expected to end with 200 OK (coming from uplink proxy).</div><div>But uplink doesn't answer at all.</div><div><br></div><div>We requested a tcpdump from uplink to see how packets are forwared from their side. And I saw that that 200 OK tries to be sent within first tcp session - to 5060 port of kamailio server.</div><div>But sngrep on our side shows nothing, nothing appears in kamailio log, so 200 OK can't reach the 5060 socket because of some transport problem I think.</div><div>Top via hf of our BYE request, contains kamailio record = <a href="http://uplink.domain.com:5060">uplink.domain.com:5060</a></div><div><br></div><div>My main thought on this count is to suppress using of random source ports for in-dialog requests, this behaviour looks irrelevant.</div><div><br></div><div>We have turned on mhomed parameter (mhomed=1). And cookbook says:</div><div>"<span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">Set the server to try to locate outbound interface on multihomed host. This parameter affects the selection of the outgoing socket for forwarding requests."</span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">But, there is a big but - we can not turn of this parameter for this moment, because routing script made with using of this one.</span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">Kamilio works on AWS EC2 platform. It has following IP address schema:</span></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">private address atouched to container -> public address assinged to this private address (so this is standard ip address schema for AWS containers).</span></font></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">For this example private address will be: 10.0.0.1<br>and public address will be: 100.0.0.1</span></font></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">Configuration - main parameters (all values are changed for an example):</span></div><div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">advertised_address=our.kamailio.server</span></font></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">advertised_port=5060</span></font></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px"><br></span></font></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">alias=</span></font><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">our.kamailio.server</span></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">alias=</span></font><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">our.kamailio.server:5060</span><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">alias=100.0.0.1</span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px">alias=<a href="http://100.0.0.1:5060">100.0.0.1:5060</a></span><br></div></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px"><br></span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px">alias=10.0.0.1</span><span style="font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">alias=<a href="http://10.0.0.1:5060">10.0.0.1:5060</a></span><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">auto_aliases=no</span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">port=5060</span></div><div><br></div><div>listen=100.0.0.1</div><div>listen=10.0.0.1</div><div><br></div><div><font color="#000000" face="sans-serif"><span style="font-size:12.7px">listen=tcp:</span></font><span style="font-size:12.7px;color:rgb(0,0,0);font-family:sans-serif"><a href="http://100.0.0.1:5060">100.0.0.1:5060</a></span></div><div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px">listen=<font color="#000000" face="sans-serif" style="font-size:small"><span style="font-size:12.7px">tcp:</span></font><span style="font-size:12.7px"><a href="http://10.0.0.1:5060">10.0.0.1:5060</a></span></div></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px"><br></span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px">mhomed=1</span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px"><br></span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px">fork=yes</span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px">fork_delay=5000</span></div><div style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><span style="font-size:12.7px">children=6</span></div><div><span style="color:rgb(0,0,0);font-family:sans-serif;font-size:12.7px"><br></span></div><div><div>tcp_connection_lifetime=3604</div><div>tcp_accept_no_cl=yes</div><div>tcp_connect_timeout=5</div><div>tcp_send_timeout=5</div><div>tcp_rd_buf_size=16384</div><div>tcp_keepalive=yes</div><div>tcp_crlf_ping=yes</div><div>tcp_keepcnt=3</div><div>tcp_keepidle=30</div><div>tcp_keepintvl=15</div><div>tcp_max_connections=4096</div></div><div><br></div><div>One of the solutions to this problem was to add following inside the relaying route block:</div><div><pre style="font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap;word-wrap:break-word;margin:0em;color:rgb(0,0,0)">$fs = "tcp:" + "10.0.0.1" + ":5060";</pre><pre style="word-wrap:break-word;margin:0em"><font color="#000000" face="courier, courier new, monospace"><span style="font-size:14px;white-space:pre-wrap">if (!t_relay()) {
sl_reply_error();
}</span></font><span style="color:rgb(0,0,0);font-family:courier,"courier new",monospace;font-size:14px;white-space:pre-wrap">
</span></pre></div><div><br></div><div>But it seems to me it's not a smart solution.</div><div><br></div><div><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><font style="background-color:rgb(255,255,255)" color="#0b5394">-- <br>BR, Donat Zenichev
<br>Wnet VoIP team<br>Tel Ukraine: +380(44) 5-900-800
<br>Tel USA: +164(67) 8-174-17<br><a href="http://wnet.ua" target="_blank">https://w-net.us/</a></font></div></div></div></div>
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